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Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2018	Jan. 01, 2015
Accounting Policies [Line Items]
Cumulative effect of an accounting change			$ 12.2	$ 43.9
Unrealized Gain on Securities
Accounting Policies [Line Items]
Cumulative effect of an accounting change			$ (0.8)
Other Expense [Member] | Accounting Standards Update 2017-07 [Member]
Accounting Policies [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		$ 1.4
Minimum [Member]
Accounting Policies [Line Items]
Finite-Lived Intangible Asset, Useful Life	2 years
Maximum [Member]
Accounting Policies [Line Items]
Finite-Lived Intangible Asset, Useful Life	25 years
Subsidiaries [Member]
Accounting Policies [Line Items]
Ownership Interest in Subsidiary	100.00%

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[Line Items] for Accounting Policies [Table]

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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